The rule goes, NEVER let two different drivers,(size or model), play the same frequencies. You could have each driver playing a different band of frequencies but that would require multiple amps and crossovers. this then gets too complicated to set levels and crossovers. Sooooo, you have some decisions to make. The Audiobahns are designed for small sealed boxes from 0.5 cubic feet to 1 cubic foot. I would run them in separate chambers about .88 cubic feet to get the best reaults.
Different subs have different resonant frequencies and therefore you get cancelation and reenforcement at different frequencies and thus a rippled frequency curve resulting in non lifelike reproduction. This rule also applies to the same subs in slightly different sized boxes. If you cannot get the box sizes for two woofers exactly the same, you should share caveties. This is the only time that I would not put the woofers in seperate chambers.

 

ok well I am going to pick up another Memphis 1500D and keep the 2 12's and run both of them with their own amps and for get about the 15...

 

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